Limited swivel apparatus for a passenger seat

ABSTRACT

The present disclosure provides a swivel stop comprising a rotating member, a first boss coupled to the rotating member and a second boss coupled to the rotating member, and a second plate having a first interference surface and a second interference surface. An interference between the first boss and the first interference surface and the second boss and the second interference surface tends to limit the rotation of the rotating member with respect to the second plate. The swivel stop may further comprise a rail wherein the second plate is configured to translate along the rail.

FIELD

The present disclosure relates to devices for vehicle interior fixtures.More specifically, the disclosure described relates to improvedarticulation mechanisms for aircraft cabin seats.

BACKGROUND

Aircraft cabin seats tend to have different restrictions on articulationand rotation depending on their location in the cabin. Such varyingproperties may result in structurally different designs tending toincrease part count and certification costs.

SUMMARY

In various embodiments, the present disclosure provides a swivel stopcomprising a first boss and a second boss, at least one of the firstboss or the second boss coupled to a rotating member; and a second plateproximate the rotating member and having a first interference surfaceand a second interference surface, wherein at least one of a firstinterference between the first boss and the first interference surfaceor a second interference between the second boss and the secondinterference surface limits the rotation of the rotating member withrespect to the second plate.

In various embodiments, the swivel stop comprises a rail wherein thesecond plate is configured to translate along the rail. In variousembodiments, the second plate comprises an aperture. In variousembodiments, at least one of the first boss or the second boss isdisposed within the aperture. In various embodiments, the rotatingmember comprises a disk. In various embodiments, the first boss may becoupled 180degrees relative to the rotating member apart from the secondboss. In various embodiments, the coupling between the rotating memberand the first boss is a removable coupling. In various embodiments, thesecond plate comprises any rigid structural material. In variousembodiments, a boss comprises at least one of polymer, aluminum,aluminum alloy, steel, stainless steel, titanium, or titanium alloy. Invarious embodiments, the rotation of the rotating member with respect tothe second plate is configured to range from 0 degrees to 360 degrees.

In various embodiments, the present disclosure provides a cabin fixturecomprising a pedestal having a cutout, an axle having a portion disposedwithin the cutout wherein the axle is configured to translate within thecutout, a first boss coupled to a rotating member and the rotatingmember coupled to the axle, and a second plate proximate the rotatingmember having a first interference surface wherein an interferencebetween the first boss and the first interference surface tends to limitthe rotation of the rotating member with respect to the second plate.

In various embodiments, the cabin fixture comprises a rail wherein thesecond plate is configured to translate along the rail. In variousembodiments, the second plate translates in response to a translation ofthe axle. In various embodiments, the second plate comprises anaperture. In various embodiments, the rotating member comprises a disk.In various embodiments, the pedestal comprises a friction surface. Invarious embodiments, the axle is disposed within the aperture. Invarious embodiments, the second plate comprises any rigid structuralmaterial.

In various embodiments, the present disclosure provides a method ofmanufacturing a swivel stop comprising coupling a first boss and asecond boss to a rotating member, forming a second plate having a firstinterference surface and a second interference surface, configuring aninterference between the first boss and the first interference surfaceand an interference between the second boss and the second interferencesurface such that rotation of the rotating member with respect to thesecond plate tends to be limited when the second plate is disposedproximate the rotating member. The method may further compriseconfiguring the second plate to translate along a rail.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A illustrates a swivel stop, in accordance with variousembodiments;

FIG. 1B illustrates a swivel stop, in accordance with variousembodiments;

FIG. 1C illustrates a swivel stop, in accordance with variousembodiments;

FIG. 1D illustrates a swivel stop, in accordance with variousembodiments;

FIG. 1E illustrates a swivel stop, in accordance with variousembodiments;

FIG. 1F illustrates a swivel stop, in accordance with variousembodiments;

FIG. 2A illustrates a swivel stop, in accordance with variousembodiments;

FIG. 2B illustrates a perspective view of a swivel stop with therotating member omitted for clarity, in accordance with variousembodiments;

FIG. 3A illustrates a cabin fixture, in accordance with variousembodiments;

FIG. 3B illustrates a bottom up view of a cabin fixture, in accordancewith various embodiments;

FIG. 4A illustrates a cabin fixture at the limit of rotation, inaccordance with various embodiments;

FIG. 4B illustrates a cabin fixture at the limit of rotation, inaccordance with various embodiments;

FIG. 5A illustrates a cabin fixture at a limit of translation, inaccordance with various embodiments;

FIG. 5B illustrates a cabin fixture at a limit of translation, inaccordance with various embodiments; and

FIG. 6 illustrates a method of manufacturing a swivel stop, inaccordance with various embodiments.

The subject matter of the present disclosure is particularly pointed outand distinctly claimed in the concluding portion of the specification. Amore complete understanding of the present disclosure, however, may bestbe obtained by referring to the detailed description and claims whenconsidered in connection with the drawing figures, wherein like numeralsdenote like elements.

DETAILED DESCRIPTION

The detailed description of exemplary embodiments herein makes referenceto the accompanying drawings, which show exemplary embodiments by way ofillustration. While these exemplary embodiments are described insufficient detail to enable those skilled in the art to practice thedisclosure, it should be understood that other embodiments may berealized and that logical changes and adaptations in design andconstruction may be made in accordance with this disclosure and theteachings herein. Thus, the detailed description herein is presented forpurposes of illustration only and not of limitation. The scope of thedisclosure is defined by the appended claims. For example, the stepsrecited in any of the method or process descriptions may be executed inany order and are not necessarily limited to the order presented.Furthermore, any reference to singular includes plural embodiments, andany reference to more than one component or step may include a singularembodiment or step. Also, any reference to attached, fixed, connected orthe like may include permanent, removable, temporary, partial, fulland/or any other possible attachment option. Additionally, any referenceto “without contact” (or similar phrases) may also include reducedcontact or minimal contact. Surface shading lines may be used throughoutthe figures to denote different parts but not necessarily to denote thesame or different materials. In some cases, reference coordinates may bespecific to each figure.

All ranges and ratio limits disclosed herein may be combined. It is tobe understood that unless specifically stated otherwise, references to“a,” “an,” and/or “the” may include one or more than one and thatreference to an item in the singular may also include the item in theplural.

In various embodiments, a swivel stop for aircraft cabin fixtures isdisclosed. A swivel stop, according to various embodiments, may comprisea first boss coupled to a rotating member, a second boss coupled to therotating member, and a second plate proximate the rotating member havinga first interference surface and a second interference surface. Invarious embodiments, a first interference between the first boss and thefirst interference surface and a second interference between the secondboss and the second interference surface tends to limit the rotation ofthe rotating member with respect to the second plate. In variousembodiments, at least one of the first interference surface or thesecond interference surface describe a curve. The swivel stop mayfurther comprise a rail wherein the second plate is configured totranslate along the rail. The second plate may translate along the railin response to a rotation of the rotating member. In variousembodiments, the translation may describe a curve. The second plate maycomprise an aperture and at least one of the first boss or the secondboss may be disposed within the aperture. In various embodiments, thesecond plate may comprise any rigid or structural material. The rotatingmember may comprise a brake disk and may have a friction surface. Thefirst boss may be coupled at any angle from the second boss and, invarious embodiments, may be 180 degrees apart from the second boss withrespect to the rotating member. The first boss may be removably coupledto the rotating member. In various embodiments, the second boss may bean axle. The interference may be configured to limit the rotation of therotating member with respect to the second plate to a desired range. Invarious embodiments, the desired range may be up to 360 degrees. Invarious embodiments, the desired range may be up to 0 degrees. Invarious embodiments, the desired range may be up to about 270 degrees,and up to about ±30 degrees, where the term “about” in this context onlymeans ±2 degrees. In various embodiments, the desired range may beasymmetric.

In various embodiments, a cabin fixture comprises a pedestal, an axle,and a swivel stop wherein the swivel stop comprises a first boss coupledto a rotating member, the rotating member coupled to the axle, a secondplate proximate the rotating member having a first interference surfacewherein an interference between the first boss and the firstinterference surface tends to limit the rotation of the rotating memberwith respect to the second plate. In various embodiments, the firstinterference surface may describe a curve. In various embodiments, thesecond plate may comprise any rigid structural material, including butnot limited to at least one of a polymer, composite, aluminum, aluminumalloy, steel, stainless steel, titanium, or titanium alloy. The cabinfixture may further comprise a rail wherein the second plate isconfigured to translate along the rail. In various embodiments, thetranslation may describe a curve. The rotating member rotates withrespect to the second plate in response to rotation of the axle. Thesecond plate may translate in response to the rotation of the rotatingmember. In various embodiments, the axle may translate with respect tothe pedestal. The rotating member may translate in response to thetranslation of the axle and the second plate may translate along therail in response to the translation of the axle. The interferencebetween the first boss and the first interference surface tends to limitthe rotation of the rotating member with respect to the second plate andtends to limit the translation of the second plate along the rail.

With reference now to FIG. 1A, in accordance with various embodiments, aswivel stop 100 comprises a brake plate 102 disposed proximate a secondplate 104. A first boss 108 and a second boss 106 are coupled to thebrake plate 102. Second plate 104 has a first interference surface 110and a second interference surface 112. Xy axes are shown forconvenience. Second plate 104 is coupled to rail 116 and is configuredto translate along rail 116 in the y-direction.

With reference now to FIG. 2A, in accordance with various embodiments, aswivel stop 200 comprises a first plate 202 disposed proximate a secondplate 204. A first boss 208 and a second boss 206 are coupled to thefirst plate 202. Second plate 204 has a first interference surface 210,a second interference surface 212, and an aperture 216. A boss, such assecond boss 206, may be disposed in an aperture such as aperture 216. Xyaxes are shown for convenience. Second plate 204 is coupled to rail 218and is configured to translate along rail 218 in the y-direction.

In accordance with various embodiments and with reference now to FIG.2B, a swivel stop 200 is shown in perspective with the first plate 202omitted for ease of illustration. Xyz axes are shown for convenience,with z extending perpendicular to the xy plane. In that regard, ameasurement point displaced in the positive z-axis direction from agiven reference point may be considered “above” or on “top” of the givenreference point. In contrast, a measurement point displaced in thenegative z-axis direction from the given reference point may beconsidered “below” or on “bottom” of the given reference point. In thatregard, the terms “top” and “bottom” may refer to relative positionsalong the z-axis. For example, first plate 202 as depicted in FIG. 2A,is above second plate 204. Axis A-A′ is orthogonal to and passes throughthe axis of rotation, B-B′, of the first plate 202. The first boss 208is coupled to first plate 202 along the A-A′ axis at an angle ⊖, aboutthe axis of rotation B-B′, to the second boss 206. In variousembodiments, angle ⊖ may be 180 degrees and second boss 206 may liealong the A-A′ axis.

In various embodiments, a swivel stop may be made of polymer, composite,aluminum, aluminum alloy, steel, stainless steel, titanium, or titaniumalloy. In various embodiments, the second plate may be a compositesandwich construction such as one of honeycomb core laminated betweencarbon fiber panels. In various embodiments, an interference surface maybe a polymer bushing comprising a polymeric material, such asthermoplastic. The polymer bushing may comprise an aliphatic orsemi-aromatic polyamide, such as one commonly referred to in trade asnylon.

With reference now to FIGS. 3A and 3B, and in accordance with variousembodiments, a cabin fixture 300 comprises a pedestal 302, an axle 308,a brake plate 312, a first boss 316, and a second plate 320. Pedestal302 has top deck 301, bottom deck 303, brake plate cutout 310, and haslegs 304 with feet 306 configured to couple the pedestal to the floor ofan aircraft cabin. Axle 308 is coupled perpendicular to brake plate 312and is disposed within brake plate cutout 310 and is configured totranslate within the cutout. Brake plate cutout 310 tends to allow axle308 to translate in the xy plane within the boundary defined by thebrake plate cutout 310. Brake plate 312 has friction surface 314 and isdisposed below the top deck 301 of pedestal 302 with friction surface314 proximate friction surface 315, as shown in FIG. 3B, of bottom deck303.

In accordance with various embodiments and with reference now to FIG.3B, a bottom up view of cabin fixture 300 is provided to show details ofthe brake plate 312 and the second plate 320. The first boss 316 iscoupled to the brake plate 312 and a second boss 318 is coupled to thebrake plate 312. The second plate 320 is disposed proximate the brakeplate 312. Axle 308 passes through brake plate cutout 310 of pedestal302 and is coupled perpendicular to the brake plate 312. Second plate320 has a first interference surface 330, a second interference surface332, and an aperture 328. Second plate 320 further comprises axleclearance cutout 326 which tends to allow the axle 308 to translate inthe xy plane. In various embodiments, axle 308 may not penetrate secondplate 320. Thus, in such embodiments, axle clearance cutout 326 may beomitted. The second plate 320 is coupled to rail 324 and rail 322 and isconfigured to translate along rail 324 and rail 322 in the y-direction.

In various embodiments, a cabin fixture may be made of polymer,composite, aluminum, aluminum alloy, steel, stainless steel, titanium,or titanium alloy. In various embodiments, the second plate may be acomposite sandwich construction such as one of honeycomb core laminatedbetween carbon fiber panels. In various embodiments, an interferencesurface may be a polymer bushing comprising a polymeric material, suchas thermoplastic. The polymer bushing may comprise an aliphatic orsemi-aromatic polyamide, such as one commonly referred to in trade asnylon.

In accordance with various embodiments and with reference now to FIG.4A, a bottom up view of cabin fixture 300 with the swivel stop at alimit of rotation is provided. In response to rotation of axle 308,brake plate 312 is rotated with respect to second plate 320. First boss316 and second boss 318 rotate with brake plate 312 until the first boss316 contacts the first interference surface 330 and the second boss 318contacts the second interference surface 332. An interference 400between the first boss 316 and the first interference surface 330 and aninterference 402 between the second boss 318 and the second interferencesurface 332 tends to limit the rotation of the brake plate 312 withrespect to the second plate 320 to about 30 degrees, where the term“about” in this context means ±2 degrees.

In accordance with various embodiments and with reference now to FIG.4B, a bottom up view of cabin fixture 300 with the swivel stop at alimit of rotation is provided. In response to rotation of axle 308,brake plate 312 is rotated with respect to second plate 320. First boss316 and second boss 318 rotate with brake plate 312 until the first boss316 contacts the first interference surface 330 and the second boss 318contacts the second interference surface 332. An interference 404between the first boss 316 and the first interference surface 330 and aninterference 406 between the second boss 318 and the second interferencesurface 332 tends to limit the rotation of the brake plate 312 withrespect to the second plate 320 to about −30 degrees, where the term“about” in this context means ±2 degrees.

In accordance with various embodiments and with reference now to FIGS.5A and 5B, a bottom up view of cabin fixture 300 is shown illustrating atranslation of the axle 308 in the xy plane along path 500 betweenlimits defined by corners of the brake plate cutout 310. Brake plate 312is coupled to axle 308 and translates in the xy plane along path 500 inresponse to translation of the axle 308. As brake plate 312 translatesin the negative y-direction, first boss 316 contacts first interferencesurface 330 generating interference 502 and second plate 320 begins totranslate in the negative y-direction along rail 322 and rail 324 inresponse to the negative y-direction translation of the axle 308. At theend of path 500, axle 308 reaches the negative y-direction limit oftranslation defined by the brake plate cutout 310. Second plate 320 maycontinue to translate in the negative y-direction along rail 322 andrail 324 in response to inertia until second interference surface 332contacts second boss 318 which generates an interference 504 tending tolimit the negative y-direction translation of second plate 320.

With reference now to FIGS. 1B and 2A in accordance with variousembodiments, a swivel stop 1002 comprises a brake plate 1022 disposedproximate a second plate 1042. A first boss 1082 and a second boss 1062are coupled to the brake plate 1022. Second plate 1042 has a firstinterference surface 1102 and a second interference surface 1122. Secondplate 1042 is coupled to rail 1162 and is configured to translate alongrail 1162 in the y-direction. First boss 1082 and second boss 1062 aredisposed in an aperture, such as aperture 216, having a perimeter withthe first interference surface 1102 and the second interference surface1122 coincident with a portion of the perimeter of the aperture. Asbrake plate 1022 rotates clockwise with respect to the second plate1042, the first boss 1082 tends to contact the first interferencesurface 1102 and the second boss 1062 tends to contact the secondinterference surface 1122 thereby tending to limit the clockwiserotation of the brake plate 1022. As brake plate 1022 rotatescounter-clockwise with respect to the second plate 1042, the first boss1082 tends to contact the second interference surface 1122 and thesecond boss 1062 tends to contact the first interference surface 1102thereby tending to limit the counter-clockwise rotation of the brakeplate 1022.

With reference now to FIGS. 1C and 3B, in accordance with variousembodiments, a swivel stop 1004 comprises a brake plate 1024 disposedproximate a second plate 1044. A first boss 1084 and an axle 1064 arecoupled to the brake plate 1024. Second plate 1044 has a firstinterference surface 1104 and a second interference surface 1124. Secondplate 1044 is coupled to rail 1164 and is configured to translate alongrail 1164 in the y-direction. The axle 1064 is disposed in an axleclearance cutout, such as cutout 326. Second interference surface 1124may be coincident with a portion of an axle clearance cutout, such ascutout 326, and tend to allow the axle 1064 to translate, with respectto the second plate 1044, in the x-direction. As brake plate 1024rotates clockwise with respect to the second plate 1044, the first boss1084 tends to contact the first interference surface 1104 and the axle1064 tends to contact the second interference surface 1124 therebytending to limit the clockwise rotation of the brake plate 1024. Asbrake plate 1024 rotates counter-clockwise with respect to the secondplate 1044, the first boss 1084 tends to contact the first interferencesurface 1104 and the axle 1064 tends to contact the second interferencesurface 1124 thereby tending to limit the counter-clockwise rotation ofthe brake plate 1024. In various embodiments, an interference betweenaxle 1064 and second interference surface 1124 may tend to prevent theaxle 1064 from translating, with respect to second plate 1044, in they-direction.

With reference now to FIGS. 1D and 2B, in accordance with variousembodiments, a swivel stop 1006 comprises a brake plate 1026 disposedproximate a second plate 1046. A first boss 1086 and an axle 1066 arecoupled to the brake plate 1026. Second plate 1046 has a firstinterference surface 1106 and a second interference surface 1126. Secondplate 1046 is coupled to rail 1166 and is configured to translate alongrail 1166 in the y-direction. First boss 1086 is disposed in anaperture, such as aperture 216, having a perimeter with the firstinterference surface 1106 coincident with a portion of the perimeter ofthe aperture. As brake plate 1026 rotates clockwise with respect to thesecond plate 1046, the first boss 1086 tends to contact the firstinterference surface 1106 and the axle 1066 tends to contact the secondinterference surface 1126 thereby tending to limit the clockwiserotation of the brake plate 1026. As brake plate 1026 rotatescounter-clockwise with respect to the second plate 1046, the first boss1086 tends to contact the first interference surface 1106 and the axle1066 tends to contact the second interference surface 1126 therebytending to limit the counter-clockwise rotation of the brake plate 1026.

With reference now to FIGS. 1E and 2B, in accordance with variousembodiments, a swivel stop 1008 comprises a brake plate 1028 disposedproximate a second plate 1048. A first boss 1088 and a second boss 1068are coupled to the brake plate 1028. Second plate 1048 has a firstinterference surface 1108 and a second interference surface 1128. Secondplate 1048 is coupled to rail 1168 and is configured to translate alongrail 1168 in the y-direction. First boss 1088 is disposed in a firstaperture, such as aperture 216, having a first perimeter with the firstinterference surface 1108 coincident with a portion of the firstperimeter. Second boss 1068 is disposed within a second aperture havinga second perimeter with the second interference surface 1128 coincidentwith a portion of the second perimeter. As brake plate 1028 rotatesclockwise with respect to the second plate 1048, the first boss 1088tends to contact the first interference surface 1108 and the second boss1068 tends to contact the second interference surface 1128 therebytending to limit the clockwise rotation of the brake plate 1028. Asbrake plate 1028 rotates counter-clockwise with respect to the secondplate 1048, the first boss 1088 tends to contact the first interferencesurface 1108 and the second boss 1068 tends to contact the secondinterference surface 1128 thereby tending to limit the counter-clockwiserotation of the brake plate 1028.

With reference now to FIGS. 1F and 3B, in accordance with variousembodiments, a swivel stop 1005 comprises a brake plate 1025 disposedproximate a second plate 1045. A first boss 1085 and an axle 1065 arecoupled to the brake plate 1025. Second plate 1045 has a firstinterference surface 1105 and a second interference surface 1125. Secondplate 1045 is coupled to rail 1165 and is configured to translate alongrail 1165 in the y-direction. The axle 1065 and the first boss 1085 aredisposed in an axle clearance cutout, such as cutout 326. At least oneof the first interference surface 1105 or second interference surface1125 may be coincident with a portion of an axle clearance cutout, suchas cutout 326, and tend to allow the axle 1065 to translate, withrespect to the second plate 1045, in the x-direction. As brake plate1025 rotates clockwise with respect to the second plate 1045, the firstboss 1085 tends to contact the second interference surface 1125 and theaxle 1065 tends to contact the first interference surface 1105 therebytending to limit the clockwise rotation of the brake plate 1025. Asbrake plate 1025 rotates counter-clockwise with respect to the secondplate 1045, the first boss 1085 tends to contact the first interferencesurface 1105 and the axle 1065 tends to contact the second interferencesurface 1125 thereby tending to limit the counter-clockwise rotation ofthe brake plate 1025.

In various embodiments and with reference now to FIG. 6, a method 600 ofmanufacturing a swivel stop may comprise coupling a first boss 602 and asecond boss to a rotating member, forming a second plate 604 having afirst interference surface and a second interference surface, andconfiguring an interference 606 between the first boss and the firstinterference surface and the second boss and the second interferencesurface such that the rotation of the rotating member with respect tothe second plate tends to be limited when the second plate is disposedproximate the rotating member. With combined reference to FIGS. 6, 2A,and 2B configuring an interference 606 may comprise coupling a firstboss, such as first boss 208, to a rotating member, such as first plate202, at an angle from a second boss, such as second boss 206, about theaxis of rotation of a rotating member, such as first plate 202. Formingmay comprise subtractive manufacturing such as casting, forging,milling, grinding, machining, and the like. Forming may also compriseadditive manufacturing. The method may further comprise configuring thesecond plate 608 to translate along a rail.

Benefits, other advantages, and solutions to problems have beendescribed herein with regard to specific embodiments. Furthermore, theconnecting lines shown in the various figures contained herein areintended to represent exemplary functional relationships and/or physicalcouplings between the various elements. It should be noted that manyalternative or additional functional relationships or physicalconnections may be present in a practical system. However, the benefits,advantages, solutions to problems, and any elements that may cause anybenefit, advantage, or solution to occur or become more pronounced arenot to be construed as critical, required, or essential features orelements of the disclosure. The scope of the disclosure is accordinglyto be limited by nothing other than the appended claims, in whichreference to an element in the singular is not intended to mean “one andonly one” unless explicitly so stated, but rather “one or more.”Moreover, where a phrase similar to “at least one of A, B, or C” is usedin the claims, it is intended that the phrase be interpreted to meanthat A alone may be present in an embodiment, B alone may be present inan embodiment, C alone may be present in an embodiment, or that anycombination of the elements A, B and C may be present in a singleembodiment; for example, A and B, A and C, B and C, or A and B and C.Different cross-hatching is used throughout the figures to denotedifferent parts but not necessarily to denote the same or differentmaterials

Systems, methods and apparatus are provided herein. In the detaileddescription herein, references to “one embodiment”, “an embodiment”,“various embodiments”, etc., indicate that the embodiment described mayinclude a particular feature, structure, or characteristic, but everyembodiment may not necessarily include the particular feature,structure, or characteristic. Moreover, such phrases are not necessarilyreferring to the same embodiment. Further, when a particular feature,structure, or characteristic is described in connection with anembodiment, it is submitted that it is within the knowledge of oneskilled in the art to affect such feature, structure, or characteristicin connection with other embodiments whether or not explicitlydescribed. After reading the description, it will be apparent to oneskilled in the relevant art(s) how to implement the disclosure inalternative embodiments.

Furthermore, no element, component, or method step in the presentdisclosure is intended to be dedicated to the public regardless ofwhether the element, component, or method step is explicitly recited inthe claims. No claim element herein is to be construed under theprovisions of 35 U.S.C. 112(f) unless the element is expressly recitedusing the phrase “means for.” As used herein, the terms “comprises”,“comprising”, or any other variation thereof, are intended to cover anon-exclusive inclusion, such that a process, method, article, orapparatus that comprises a list of elements does not include only thoseelements but may include other elements not expressly listed or inherentto such process, method, article, or apparatus.

What is claimed is:
 1. A swivel stop comprising: a rotating membercomprising a circular disc; a first boss and a second boss coupled tothe rotating member, wherein the first boss is coupled 180 degrees apartfrom the second boss as measured about an axis of rotation of therotating member; a second plate proximate the rotating member and havinga first interference surface and a second interference surface, whereinthe rotating member rotates relative to the second plate and at leastone of a first interference between the first boss and the firstinterference surface or a second interference between the second bossand the second interference limits a rotation of the rotating memberwith respect to the second plate; and a rail coupled to the secondplate, wherein the second plate is configured to translate along therail in a direction perpendicular to the axis of rotation of therotating member.
 2. The swivel stop of claim 1, wherein the second platecomprises an aperture.
 3. The swivel stop of claim 2, wherein at leastone of the first boss or the second boss is disposed within theaperture.
 4. The swivel stop of claim 1, wherein the coupling betweenthe rotating member and the first boss is a removable coupling.
 5. Theswivel stop of claim 1, wherein the second plate comprises a rigidstructural material.
 6. The swivel stop of claim 1, wherein the firstboss comprises at least one of polymer, aluminum, aluminum alloy, steel,stainless steel, titanium, or titanium alloy.
 7. The swivel stop ofclaim 1, wherein the rotation of the rotating member with respect to thesecond plate is configured to range from 0 degrees to about 30 degrees.